// Copyright 2023 OpenSSF Scorecard Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package hasRecentCommits

import (
	"embed"
	"fmt"
	"strconv"
	"time"

	"github.com/ossf/scorecard/v5/checker"
	"github.com/ossf/scorecard/v5/finding"
	"github.com/ossf/scorecard/v5/internal/checknames"
	"github.com/ossf/scorecard/v5/internal/probes"
	"github.com/ossf/scorecard/v5/probes/internal/utils/uerror"
)

func init() {
	probes.MustRegister(Probe, Run, []checknames.CheckName{checknames.Maintained})
}

//go:embed *.yml
var fs embed.FS

const (
	Probe          = "hasRecentCommits"
	NumCommitsKey  = "commitsWithinThreshold"
	LookbackDayKey = "lookBackDays"
	lookBackDays   = 90
)

func Run(raw *checker.RawResults) ([]finding.Finding, string, error) {
	if raw == nil {
		return nil, "", fmt.Errorf("%w: raw", uerror.ErrNil)
	}

	var findings []finding.Finding

	r := raw.MaintainedResults
	threshold := time.Now().AddDate(0 /*years*/, 0 /*months*/, -1*lookBackDays /*days*/)
	commitsWithinThreshold := 0

	for i := range r.DefaultBranchCommits {
		commit := r.DefaultBranchCommits[i]
		if commit.CommittedDate.After(threshold) {
			commitsWithinThreshold++
		}
	}

	var text string
	var outcome finding.Outcome
	if commitsWithinThreshold > 0 {
		text = "Found a contribution within the threshold."
		outcome = finding.OutcomeTrue
	} else {
		text = "Did not find contribution within the threshold."
		outcome = finding.OutcomeFalse
	}
	f, err := finding.NewWith(fs, Probe, text, nil, outcome)
	if err != nil {
		return nil, Probe, fmt.Errorf("create finding: %w", err)
	}
	f = f.WithValues(map[string]string{
		NumCommitsKey:  strconv.Itoa(commitsWithinThreshold),
		LookbackDayKey: strconv.Itoa(lookBackDays),
	})
	findings = append(findings, *f)

	return findings, Probe, nil
}
